Add server ready check before starting evaluation

[athitten]

What does this PR do ?

Adds method wait_for_server_ready to evaluation/base.py that waits for the PyTriton server to be ready and the specific model (with name defined in model_name arg) to be loaded and ready before starting evaluation.

Adds bool generation_logits_available to triton_infer_fn since check via if "output_generation_logits" in inputs is not robust in cases where output_generation_logits is popped from inputs dict in the previous line.

Collection: [Note which collection this PR will affect]

Changelog

• Add specific line by line info of high level changes in this PR.

Usage

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# Add a code snippet demonstrating how to use this 

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Additional Information

• Related to # (issue)

[athitten]

triton_request_timeout unused hence removed.

[github-actions]

beep boop 🤖: 🙏 The following files have warnings. In case you are familiar with these, please try helping us to improve the code base.

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Your code was analyzed with PyLint. The following annotations have been identified:

************* Module nemo.collections.llm.api
nemo/collections/llm/api.py:440:0: C0301: Line too long (130/119) (line-too-long)
nemo/collections/llm/api.py:568:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/api.py:15:0: W0611: Unused import os (unused-import)

-----------------------------------
Your code has been rated at 9.96/10

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Mitigation guide:

• Add sensible and useful docstrings to functions and methods
• For trivial methods like getter/setters, consider adding # pylint: disable=C0116 inside the function itself
• To disable multiple functions/methods at once, put a # pylint: disable=C0116 before the first and a # pylint: enable=C0116 after the last.

By applying these rules, we reduce the occurance of this message in future.

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